Depth adjustment features for a seed planting unit of an agricultural implement

ABSTRACT

A seed planting unit of an agricultural implement may include a wheel support arm having an upper portion and a lower portion. A wheel may be rotatably supported by the lower portion of the wheel support arm, the wheel configured to contact the soil surface to define a penetration depth setting for the ground engaging tool relative to the soil surface. A depth stop member may be provided in operative association with one of the support structure or the wheel support arm. A depth adjustment member may be selectively movable relative to the other of the support structure or the wheel support arm to vary a relative distance between an abutment portion of the depth adjustment member configured to abut against the depth stop member and the other of the support structure or the wheel support arm to set the penetration depth setting for the ground engaging tool.

FIELD OF THE INVENTION

The present subject matter relates generally to agricultural implements,and more specifically, to depth adjustment features for a seed plantingunit of an agricultural implement.

BACKGROUND OF THE INVENTION

Generally, agricultural seed planting units are towed behind a tractoror other work vehicle via a mounting bracket secured to a rigid frame ofan agricultural implement, such as a planter or seeder. These seedplanting units typically include a ground engaging tool or opener thatforms a furrow or seed planting trench for seed deposition into thesoil. Specifically, the opener is used to break the soil to enable seeddeposition. After the seed is deposited, the opener is followed by apacker wheel that packs the soil on top of the deposited seed. Thepacker wheel also serves to adjust the penetration depth of the openerwithin the soil. In certain configurations, the penetration depth of theopener is adjustable by varying a vertical position of the packer wheelrelative to the opener.

In typical configurations, the packer wheel is pivotally coupled to apacker support structure by a packer arm. Rotation of the packer armrelative to the packer support structure varies the vertical position ofthe packer wheel, thereby, in turn, adjusting the penetration depth ofthe opener. In certain configurations, the packer arm includes a seriesof openings configured to receive a fastener. The openings arepositioned such that the angle of the packer arm relative to the packersupport structure may be varied by securing the fastener to a particularopening. However, removing the fastener from one opening, rotating thepacker arm relative to the packer support structure, and securing thefastener within another opening is a time consuming process.Furthermore, certain agricultural implements have multiple seed plantingunits, and therefore have multiple openers (e.g., greater than 50, 60,70, 80, 90, or more). Because the openers are typically configured tomaintain the same penetration depth setting, the duration of the depthadjustment process is multiplied by the number of openers coupled to theimplement. Consequently, reconfiguration of the implement for adifferent penetration depth setting may result in large delays inseeding operations, thereby decreasing seeding efficiency.

Accordingly, a seed planting unit for use within an agriculturalimplement that includes improved depth adjustment features for allowingmore efficient reconfiguration of the depth settings of the implement'sopeners would be welcomed in the technology.

BRIEF DESCRIPTION OF THE INVENTION

Aspects and advantages of the invention will be set forth in part in thefollowing description, or may be obvious from the description, or may belearned through practice of the invention.

In one embodiment, the present subject matter is directed to a seedplanting unit of an agricultural implement, with the seed planting unitgenerally including a ground engaging tool configured to penetrate asoil surface, a support structure configured to support the groundengaging tool, a wheel support arm, and a wheel. The wheel support armmay be pivotally coupled to the support structure of the seed plantingunit at a pivot point and may include an upper portion and a lowerportion. The wheel may be rotatably supported by the lower portion ofthe wheel support arm and may be configured to contact the soil surfaceto define a penetration depth setting for the ground engaging toolrelative to the soil surface. The seed planting unit may further includea depth stop member and a depth adjustment member. The depth stop membermay be provided in operative association with one of the supportstructure or the wheel support arm. The depth adjustment member maygenerally include a base surface and define a plurality of levelsdisposed at varying distances relative to the base surface. The depthstop member may be configured to abut against a selected level of theplurality of levels when the wheel is contacting the soil surface to setthe penetration depth setting for the ground engaging tool. The depthadjustment member may be configured to be selectively rotated relativeto the other of the support structure or the wheel support arm toposition the selected level for abutment with the depth stop member.

In another embodiment, the present subject matter is directed to anagricultural implement including a frame and a plurality of seedplanting units supported by the frame, wherein the seed planting unitsmay be configured to deposit seeds within a field as the implement ismoved across the field. Each seed planting unit may generally include aground engaging tool configured to penetrate a soil surface, a supportstructure configured to support the ground engaging tool, a wheelsupport arm pivotally coupled to the support structure, the wheelsupport arm including an upper portion and a lower portion, and a wheel.The wheel of each seed planting unit may be rotatably supported by thelower portion of the wheel support arm and be configured to contact thesoil surface to define a penetration depth setting for the groundengaging tool relative to the soil surface. Each seed planting unit mayfurther include a depth stop member provided in operative associationwith one of the support structure or the wheel support arm.Additionally, the depth adjustment member of each seed planting unit mayinclude a base surface and define a plurality of levels disposed atvarying distances relative to the base surface, wherein the depth stopmember is configured to abut against a selected level of the pluralityof levels when the wheel is contacting the soil surface to set thepenetration depth setting for the ground engaging tool. Moreover, eachdepth adjustment member may be configured to be selectively rotatedrelative to the other of the support structure or the wheel support armto position the selected level for abutment with the associated depthstop member.

In another embodiment, the present subject matter is directed to a seedplanting unit of an agricultural implement, with the seed planting unitgenerally including a ground engaging tool configured to penetrate asoil surface, a support structure configured to support the groundengaging tool, a wheel support arm, and a wheel. The wheel support armmay be pivotally coupled to the support structure about a pivot pointand may include an upper portion and a lower portion. The wheel may berotatably supported by the lower portion of the wheel support arm andmay be configured to contact the soil surface to define a penetrationdepth setting for the ground engaging tool relative to the soil surface.The seed planting unit may further include a depth stop member and adepth adjustment member. The depth stop member may be provided inoperative association with one of the support structure or the wheelsupport arm while the depth adjustment member may be provided inoperative association with the other of the support structure or thewheel support arm. The depth adjustment member may be configured to beselectively movable relative to the other of the support structure orthe wheel support arm to vary a relative distance between an abutmentportion of the depth adjustment member configured to abut against thedepth stop member and the other of the support structure or the wheelsupport arm. The seed planting unit may further include a biasing memberconfigured to apply a biasing force against the depth adjustment memberto bias the portion of the depth adjustment member towards the other ofthe support structure or the wheel support arm. The depth stop membermay be configured to selectively abut the abutment portion of the depthadjustment member when the wheel is contacting the soil surface to setthe penetration depth setting for the ground engaging tool.

In a further embodiment, the present subject matter is directed to aseed planting unit of an agricultural implement, with the seed plantingunit generally including a ground engaging tool configured to penetratea soil surface, a support structure configured to support the groundengaging tool, a wheel support arm, and a wheel. The wheel support armmay be pivotally coupled to the support structure and may generallyinclude an upper portion and a lower portion. The wheel may be rotatablysupported by the lower portion of the wheel support arm, the wheelconfigured to contact the soil surface to define a penetration depthsetting for the ground engaging tool relative to the soil surface. Theseed planting unit may further include a depth stop member and a depthadjustment member. The depth stop member may be provided in operativeassociation with one of the support structure or the wheel support armwhile the depth adjustment member may be provided in operativeassociation with the other of the support structure or the wheel supportarm. The depth adjustment member may be configured to be selectivelyaxially movable relative to the other of the support structure or thewheel support arm to vary a relative distance between an abutmentportion of the depth adjustment member configured to abut against thedepth stop member and the other of the support structure or the wheelsupport arm. The depth stop member may be configured to selectively abutthe abutment portion of the depth adjustment member when the wheel iscontacting the soil surface to set the penetration depth setting for theground engaging tool.

In another embodiment, the present subject matter is directed to anagricultural implement including a frame and a plurality of seedplanting units supported by the frame, seed planting units beingconfigured to deposit seeds within a field as the implement is movedacross the field. Each seed planting unit may generally include a groundengaging tool configured to penetrate a soil surface, a supportstructure configured to support the ground engaging tool, a wheelsupport arm pivotally coupled to the support structure, the wheelsupport arm including an upper portion and a lower portion, and a wheel.The wheel may be rotatably supported by the lower portion of the wheelsupport arm and be configured to contact the soil surface to define apenetration depth setting for the ground engaging tool relative to thesoil surface. Each seed planting unit may further include a depth stopmember provided in operative association with one of the supportstructure or the wheel support arm. Additionally, each seed plantingunit may include a depth adjustment member provided in operativeassociation with the other of the support structure or the wheel supportarm. For each seed planting unit, the depth adjustment member may beconfigured to be selectively axially movable relative to the other ofthe support structure or the wheel support arm to vary a relativedistance between an abutment portion of the depth adjustment memberconfigured to abut against the depth stop member and the other of thesupport structure or the wheel support arm. Moreover, for each seedplanting unit, the depth stop member may be configured to selectivelyabut the abutment portion of the depth adjustment member when the wheelis contacting the soil surface to set the penetration depth setting forthe ground engaging tool.

These and other features, aspects and advantages of the presentinvention will become better understood with reference to the followingdescription and appended claims. The accompanying drawings, which areincorporated in and constitute a part of this specification, illustrateembodiments of the invention and, together with the description, serveto explain the principles of the invention.

BRIEF DESCRIPTION OF THE DRAWINGS

A full and enabling disclosure of the present invention, including thebest mode thereof, directed to one of ordinary skill in the art, is setforth in the specification, which makes reference to the appendedfigures, in which:

FIG. 1 illustrates a perspective view of one embodiment of anagricultural implement including multiple seed planting units inaccordance with aspects of the present subject matter;

FIG. 2 illustrates a side view of one embodiment of a seed planting unitsuitable for use within the agricultural implement shown in FIG. 1 inaccordance with aspects of the present subject matter, particularlyillustrating the seed planting unit including a depth stop member and anassociated depth adjustment member for adjusting the penetration depthsetting of a ground engaging tool of the unit;

FIG. 3 illustrates a partial, perspective view of the seed planting unitshown in FIG. 2 with various components of the unit, including a packerwheel and a portion of the ground engaging tool, removed for purposes ofillustration, particularly illustrating aspects of a support structure,a wheel support arm, the depth stop member and the depth adjustmentmember of the seed planting unit in accordance with aspects of thepresent subject matter;

FIG. 4 illustrates a top view of the depth adjustment member of the seedplanting unit shown in FIG. 3 in accordance with aspects of the presentsubject matter;

FIG. 5 illustrates a partial, perspective view of the depth adjustmentmember of the seed planting unit shown in FIG. 2 in accordance withaspects of the present subject matter;

FIG. 6 illustrates a partial, perspective view of the depth adjustmentmember positioned relative to the wheel support arm of the seed plantingunit shown in FIG. 3 in accordance with aspects of the present subjectmatter, particularly illustrating the depth adjustment member partiallyexploded away from the wheel support arm;

FIG. 7 illustrates a partial, side view of the seed planting unit shownin FIG. 2, particularly illustrating the depth stop member positionedrelative to the depth adjustment member;

FIG. 8 illustrates a partial, side view of the depth adjustment memberas installed relative to the wheel support arm of the seed planting unitshown in FIG. 2 in accordance with aspects of the present subjectmatter, particularly illustrating features for selectively locking thedepth adjustment member relative to the wheel support arm;

FIG. 9 illustrates a partial, side view of the depth adjustment memberas installed relative to the wheel support arm of the seed planting unitshown in FIG. 2 in accordance with aspects of the present subjectmatter, particularly illustrating alternative features for selectivelylocking the depth adjustment member relative to the wheel support arm;

FIG. 10 illustrates a side view of the seed planting unit shown in FIG.2, particularly illustrating the depth adjustment member positionedrelative to the wheel support arm such that the ground engaging tool isdisposed at its maximum penetration depth setting;

FIG. 11 illustrates a side view of the seed planting unit shown in FIG.2, particularly illustrating the depth adjustment member positionedrelative to the wheel support arm such that the ground engaging tool isdisposed at its minimum penetration depth setting;

FIG. 12 illustrates a partial, perspective view of another embodiment ofthe depth adjustment member of the seed planting unit shown in FIG. 2 inaccordance with aspects of the present subject matter, particularlyillustrating the seed planting unit including an actuator configured toadjust the position of the depth adjustment member relative to the depthstop member;

FIG. 13 illustrates a partial, perspective view of another embodiment ofthe depth adjustment member of the seed planting unit shown in FIG. 2 inaccordance with aspects of the present subject matter, particularlyillustrating the seed planting unit including an actuator;

FIG. 14 illustrates a partial, perspective view of another embodiment ofa seed planting unit suitable for use within the agricultural implementshown in FIG. 1, particularly illustrating aspects of a supportstructure, a wheel support arm, a depth stop member, and a depthadjustment member of the seed planting unit in accordance with aspectsof the present subject matter;

FIG. 15 illustrates a side view of another embodiment of a seed plantingunit suitable for use within the agricultural implement shown in FIG. 1in accordance with aspects of the present subject matter, particularlyillustrating the seed planting unit including a depth stop member, anassociated depth adjustment member, and depth adjustment attachmentsconfigured for adjusting the penetration depth setting of a groundengaging tool of the unit;

FIG. 16 illustrates a partial, perspective view of the seed plantingunit shown in FIG. 15, with various components of the unit, including apacker wheel and a portion of the ground engaging tool, removed forpurposes of illustration, particularly illustrating aspects of a supportstructure, a wheel support arm, the depth stop member, the depthadjustment member and depth adjustment attachments of the seed plantingunit in accordance with aspects of the present subject matter;

FIG. 17 illustrates a partial, side view of the depth adjustment memberas installed relative to the wheel support arm of the seed planting unitshown in FIG. 16 in accordance with aspects of the present subjectmatter, particularly illustrating the depth adjustment attachmentscoupled to the depth adjustment member; and

FIG. 18 illustrates a top view of one embodiment of one of the depthadjustment attachments shown in FIG. 17 in accordance with aspects ofthe present subject matter.

DETAILED DESCRIPTION OF THE INVENTION

Reference now will be made in detail to embodiments of the invention,one or more examples of which are illustrated in the drawings. Eachexample is provided by way of explanation of the invention, notlimitation of the invention. In fact, it will be apparent to thoseskilled in the art that various modifications and variations can be madein the present invention without departing from the scope or spirit ofthe invention. For instance, features illustrated or described as partof one embodiment can be used with another embodiment to yield a stillfurther embodiment. Thus, it is intended that the present inventioncovers such modifications and variations as come within the scope of theappended claims and their equivalents.

In general, the present subject matter is directed to a seed plantingunit for an agricultural implement. In several embodiments, theimplement may correspond to a planter or seeder and may include aplurality of seed planting units coupled to or otherwise supported by aframe of the planter/seeder. In one embodiment, each seed planting unitmay include a ground engaging tool configured to open the soil surfaceto create a seed trench or furrow, and a wheel rotatably supported by acorresponding wheel support arm of the seed planting unit, with thewheel being configured to roll across or otherwise contact the soilsurface to set a penetration depth of the ground engaging tool, as wellas to close the seed trench upon deposition of seeds therein.

Additionally, in accordance with aspects of the present subject matter,each seed planting unit may be configured to allow a penetration depthsetting for the ground engaging tool to be adjusted. Specifically, theseed planting unit may include one or more depth adjustment componentsand/or features configured to allow the vertical position of the wheelto be adjusted relative to the ground engaging tool, which, in turn, mayresult in a corresponding adjustment in the penetration depth setting.As such, the depth adjustment components(s) and/or feature(s) may beused to set the desired penetration depth for the ground engaging toolbased on, e.g., the soil composition or seed type, to allow for moreefficient and/or effective seeding operations.

In several embodiments, the seed planting unit may include a depth stopmember in operative association with one of the support structure or thewheel support arm. Additionally, the seed planting unit may include adepth adjustment member configured to be selectively moved relative tothe other of the support structure or wheel support arm to adjust thepenetration depth for the ground engaging tool. The depth adjustmentmember may be configured to have an abutment portion and an elongatedportion. Specifically, in one embodiment, the abutment portion may beconfigured to have a graduated profile positioned relative to a basesurface, with the graduated profile defining a plurality of steppedsurfaces or “levels”. As will be described below, the depth stop membermay be configured to abut against a selected level of the plurality oflevels when the support structure is in a working position to set apenetration depth setting of the associated ground engaging tool. Insuch an embodiment, the depth stop member may be configured to be spacedapart from the depth adjustment member when the support structure is inan adjustment position such that the depth adjustment member may berotatable relative to the support structure or wheel support arm (e.g.,to adjust the penetration depth setting of the associated groundengaging tool). Moreover, in one embodiment, the various levels of thedepth adjustment member may be spaced apart from its base surface byvarying distances to allow the depth stop member to be held at differingdiscrete positions from the wheel support arm or the support structure,thereby permitting the penetration depth setting for the ground engagingtool to be similarly adjusted in incremental amounts corresponding tothe difference in distances between adjacent levels of the depthadjustment member.

Additionally, in one embodiment, the base surface of the depthadjustment member may include a first plurality of engagement elementsand the support structure or the wheel support arm may include a secondplurality of engagement elements, the first plurality of engagementelements configured to engage the second plurality of engagementelements to limit or prevent movement of the depth adjustment memberrelative to the support structure or the wheel support arm.

In several embodiments, the seed planting unit may additionally includea biasing element or tightening element generally positioned against aside of the support structure or wheel support arm opposite the depthadjustment member. In such embodiments, the biasing or tighteningelement engages the depth adjustment member to limit or prevent movementof the depth adjustment member relative to the support structure orwheel support arm.

In another embodiment, the seed planting unit may include an actuatorconfigured to adjust the position of the depth adjustment memberrelative to the support structure or wheel support arm. Specifically,the actuator may be configured to selectively actuate the depthadjustment member when the support structure is in the adjustmentposition such that the depth adjustment member may be moved relative tothe support structure or wheel support arm, thereby permitting thepenetration depth setting for the ground engaging tool to be adjustedautomatically.

It should be appreciated that, in accordance with aspects of the presentsubject matter, the position of the depth adjustment member relative tothe support structure or wheel support arm may be adjusted eithermanually or automatically to adjust the depth penetration setting forthe ground engaging tool. For instance, in one embodiment, an operatormay be allowed to manually adjust the positioning of the depthadjustment member (e.g., rotating and/or pulling the depth adjustmentmember). In another embodiment, as indicated above, the seed plantingunit may include an electronically controlled actuator coupled to thedepth adjustment member (e.g., a rotary motor). In such an embodiment,the actuator may be configured to be selectively controlled to actuatethe depth adjustment member so as to move the member relative to thesupport structure or wheel support arm, thereby permitting thepenetration depth setting for the ground engaging tool to be adjustedautomatically.

In yet another embodiment, the base surface of the depth adjustmentmember may be configured to be spaced apart from the support structureor wheel support arm. For example, in one embodiment, one or more depthadjustment attachments may be configured to be attached to the elongatedportion of the depth adjustment member between the base surface of thedepth adjustment member and the support structure or the wheel supportarm. In such a way, the depth stop member may be held at differingdiscrete positions from the wheel support arm, thereby permitting thepenetration depth setting for the ground engaging tool to be similarlyadjusted in incremental amounts corresponding to the combined thicknessof the depth adjustment attachments.

Referring now to the drawings, FIG. 1 illustrates a perspective view ofone embodiment of an agricultural implement 100. In general, theimplement 100 is configured to be towed behind a work vehicle, such as atractor (not shown). As shown in FIG. 1, the implement 100 may include atow bar assembly 102, which is shown in the form of an A-frame hitchassembly. The tow bar assembly 102 may include a hitch configured toattach to an appropriate tractor hitch via a ball, clevis, or othercoupling. Additionally, the tow bar assembly 102 may be coupled to atool bar 104, which, in turn, supports multiple tool frames 106.Moreover, in several embodiments, each tool frame 106 may includemultiple seed planting units 108, such as a plurality of hoe openers,coupled thereto or supported thereby. As discussed in detail below, eachseed planting unit 108 may be configured to facilitate quick andefficient reconfiguration of the unit 108 for varying penetration depthsettings in accordance with aspects of the present subject matter.

It should be appreciated that the configuration of the implement 100described above and shown in FIG. 1 is provided only to place thepresent subject matter in an exemplary field of use. Thus, it should beappreciated that the present subject matter may be readily adaptable toany manner of implement configuration.

Referring now to FIG. 2, a side view of one embodiment of a seedplanting unit 108 suitable for use within an agricultural implement(e.g., the implement 100 shown in FIG. 1) is illustrated in accordancewith aspects of the present subject matter, particularly illustratingthe unit 108 including one embodiment of depth adjustment components orfeatures configured to facilitate reconfiguration of the unit'spenetration depth setting. It should be appreciated that, although theseed planting unit 108 is shown and described herein as corresponding toa hoe opener, the seed planting unit 108 may generally correspond to anysuitable row unit having any suitable configuration that facilitates thedeposition of seeds within the soil. Additionally, it should beappreciated that, although the seed planting unit 108 will generally bedescribed in the context of the implement 100 shown in FIG. 1, the unit108 may generally be configured to be installed on any suitableimplement having any suitable implement configuration.

As shown in FIG. 2, the seed planting unit 108 includes a mountingbracket 110, a first linkage member 112, a second linkage member 114,and a biasing device or actuator, such as a cylinder 116 (e.g.,hydraulic and/or pneumatic piston-cylinder assembly). In one embodiment,the cylinder 116 may be hydraulically coupled to a power supply thatprovides a flow of pressurized hydraulic fluid which displaces a pistonrod extending from the cylinder. The mounting bracket 110 and associatedhardware are generally configured to interface with the tool frame 106(FIG. 1), thereby securing the seeding planting unit 108 to theimplement 100 (FIG. 1). For instance, multiple seed planting units 108may be mounted in parallel along the tool frame 106 (FIG. 1) to form aseeding assembly or unit. In the illustrated embodiment, the firstlinkage member 112, the second linkage member 114, and the mountingbracket 110 generally form elements of a parallel linkage, also known asa four bar linkage. As will be appreciated, components of the seedplanting unit 108, such as the mounting bracket 110 (and associatedhardware), first linkage member 112, and second linkage member 114, maybe made of any suitable material, such as steel. It should beappreciated that, in other embodiments, any other suitable linkage(s) orlinkage assembly may be used to couple the seed planting unit 108 to thetool frame 106. For example, in an alternative embodiment, only one ofthe linkage members 112, 114 may be used to couple the seed plantingunit 108 to the frame 106, such as configuring a single linkage for usein a trailing arm opener design.

As is illustrated in FIG. 2, the cylinder 116 may be attached to a shank118 either directly, e.g., via a pin at the end of the piston rod, orindirectly, e.g., via a swing link or other linkage coupled between theshank 118 and the cylinder 116. A ground engaging tool, such as theillustrated opener 120, is also attached to the shank 118 and isconfigured to engage the soil. Contact force between the opener 120 andthe soil establishes a moment about a shank pivot joint. This moment isresisted by the force applied to the shank 118 by the cylinder 116.Furthermore, the linkage is configured to facilitate vertical movementof the implement 100, while maintaining the opener 120 at a desiredpenetration depth setting 122 within the soil 124. The desiredpenetration depth setting 122 may be selected based on soil conditions,or environmental factors, among other considerations. As illustrated,the linkage is coupled to a wheel support structure, such as theillustrated support structure 126.

A wheel support arm 128, including a packer wheel 130, is pivotallycoupled to the support structure 126 by a pin 132 disposed throughopenings within the wheel support arm 128 and the support structure 126.The pin 132 is generally positioned at an interface between an upperportion 134 and a lower portion 136 of the wheel support arm 128. Thepacker wheel 130 is rotatably coupled to the lower portion 136 of thewheel support arm 128 and is configured to roll along or otherwisecontact the soil surface to both pack the soil on top of deposited seedsand limit the penetration depth setting 122 of the opener 120. The pin132 enables rotation of the wheel support arm 128 with respect to thesupport structure 126. However, in a working mode, rotation of the wheelsupport arm 128 relative to the support structure 126 is blocked byselective contact between a depth adjustment member 200 and a depth stopmember 202 of the seed planting unit 108.

As discussed in detail below, in one embodiment, the depth adjustmentmember 200 is configured to be rotatable relative to the wheel supportarm 128 when it is desired to adjust the penetration depth setting 122of the opener 120. Specifically, in such an embodiment, the depthadjustment member 200 is configured to define an abutment portionagainst which the depth stop member 202, operatively associated with thesupport structure 126, may abut or contact during the working mode tolimit rotation of the wheel support arm 128. Additionally, the abutmentportion may define a graduated profile relative to a base surface. Assuch, movement of the depth adjustment member 200, and its associatedgraduated profile, relative to the wheel support arm 128 may thereforeadjust a distance between the depth stop member 202 and the wheelsupport arm 128 through which the depth stop member 202 will contact thegraduated profile during the working mode. Once a desired penetrationdepth setting 122 has been established, the depth adjustment member 200may be locked into position relative to the wheel support arm 128,thereby limiting rotation of the wheel support arm 128 and enabling theseed planting unit 108 to enter the working mode. As previouslydiscussed, the packer wheel 130 rotates across the surface of the soilto limit the penetration depth setting 122 of the opener 120.Consequently, the difference in vertical position between the packerwheel 130 and the opener 120 defines the penetration depth setting 122of the opener 120 within the soil 124.

Referring now to FIGS. 3-11, various views of one embodiment of a seedplanting unit (e.g. the unit 108 shown in FIG. 2) are illustrated inaccordance with aspects of the present subject matter. Specifically,FIG. 3 illustrates a partial, perspective view of the unit 108 describedabove with reference to FIG. 2, particularly depicting variouscomponents of the unit 108 (e.g., the opener 122 and the packer wheel132) removed from the drawing for purposes of illustration. FIGS. 4 and5 illustrate perspective views of a portion of the depth adjustmentmember 200 shown in FIGS. 2 and 3. FIG. 6 illustrates a partialperspective view of the seed planting unit 108 shown in FIG. 3,particularly illustrating the depth adjustment member 200 partiallyexploded away from a portion of the wheel support arm 128. FIG. 7illustrates a side view of the support structure 126 of the seedplanting unit 108 shown in FIG. 3, particularly illustrating the depthstop member 202 formed integrally with the support structure 126 andabutting against the depth adjustment member 200. FIGS. 8 and 9illustrate partial, side views of features for selectively locking thedepth adjustment member 200 relative to the wheel support arm 128.Additionally, FIGS. 10 and 11 illustrate differing views of the seedplanting unit 108 shown in FIG. 3, particularly illustrating the depthadjustment member 200 positioned at a maximum depth settingcorresponding to a deepest penetration depth setting of the opener 120(FIG. 10) and at a minimum depth setting corresponding to a shallowestpenetration depth setting of the opener 120 (FIG. 11).

As indicated above, the seed planting unit 108 may include both a depthadjustment member 200 and a depth stop member 202 to allow thepenetration depth setting of the opening 120 to be adjusted, as desiredor necessary. As shown in the illustrated embodiment, the depthadjustment member 200 is generally provided in operative associationwith the wheel support arm 128 of the seed planting unit 108 while thedepth stop member 202 is generally provided in operative associationwith the support structure 126 of the seed planting unit 108.Specifically, as will be described below, the depth adjustment member200 may be configured to be rotatably or movably coupled to the wheelsupport arm 128 to allow the relative positioning of the depthadjustment member 200 to be adjusted while the depth stop member 202 maybe configured to be fixed relative to the support structure 126 (e.g.,by being formed integrally with the support structure 126 or by beingrigidly coupled to the support structure 126. However, as will bedescribed below with reference to FIG. 14, the configuration of thedepth adjustment components may be reversed, with the depth adjustmentmember 200 being rotatably or movably coupled to the support structure126 and the depth stop member 202 being fixed relative to the wheelsupport arm 128.

As shown in the illustrated embodiment, the depth stop member 202 isgenerally configured to contact or abut against a portion of a graduatedprofile defined by the depth adjustment member 200. In general, thedepth adjustment member 200 may be configured to be selectively movablerelative to the wheel support arm 128 to adjust the relative positioningbetween the depth adjustment member 200 and the depth stop member 202,thereby varying which portion of the graduated profile the depth stopmember 202 is configured to engage and, thus, varying the amount thatthe wheel support arm 128 is configured to pivot relative to the supportstructure 126. Specifically, the adjustment of the relative positioningbetween the depth adjustment member 200 and the depth stop member 202varies the amount that the wheel support arm 128 is allowed to pivotbefore coming into contact with the depth stop member 202, which, inturn, varies the vertical positioning of the opener 120 (FIG. 2)relative to the packer wheel 130 (FIG. 2) and, thus, adjusts thepenetration depth setting 122 of the opener 120. Additionally, in oneembodiment, the depth adjustment member 200 may be configured to beselectively locked or otherwise engaged relative to the wheel supportarm 128 to prevent further rotation of the depth adjustment member 200relative to both the wheel support arm 128 and the depth stop member202, thereby setting the desired penetration depth for the opener 120.

As particularly shown in FIGS. 4 and 5, the graduated profile (e.g.,graduated profile 206) of the depth adjustment member 200 generallycorresponds to a plurality of levels 208 formed within or defined alongan upper surface (i.e., an abutment portion 204) of the depth adjustmentmember 200. In one embodiment, the depth adjustment member 200 maydefine a plurality of adjustment sections 216, each one of theadjustment sections 216 being defined along a different portion of theouter perimeter of the depth adjustment member 200. In such anembodiment, each of the plurality of levels 208 may be defined by arespective one of the plurality of sections 216. In one embodiment, thedepth adjustment member 200 may be generally configured to be circular,e.g. as a depth adjustment wheel, where the outer perimeter is definedby an outer circumference having a radius 212 extending from an axis ofrotation 214 of the depth adjustment member 200. In such an embodiment,each of the plurality of adjustment sections 216 extendscircumferentially around a respective circumferential section of theouter circumference of the depth adjustment member 200. For example,each of the sections 216 is shown in FIG. 4 as extending along arespective arc of the outer circumference, the arc corresponding to acircumferential angle A1 at the radius 212 from the axis of rotation 214of the depth adjustment member 200.

While the adjustment sections 216 are shown as extending along the samecircumferential angle, i.e. circumferential angle A1, this should not beconstrued as limiting. Instead, the sections 216 may be configured to bedefined along differently sized circumferential angles to provide adesired range of incremental levels for adjusting the penetration depthsetting 122. Further, while the sections 216 are shown as extending theentire radial distance (i.e. radius 212) between the circumference andthe axis of rotation 214, this should also not be construed as limiting.Instead, the radial sections 216 may form only a portion of such radialdistance, such as by forming a radial segment.

In some embodiments, as shown in FIG. 5, the graduated profile 206 maybe generally spaced apart from a bottom or base surface 218 of the depthadjustment member 200 such that the levels 208 defined by the variousadjustment sections 216 are disposed at varying distances relative tothe base surface 218. For example, a first level 208A is spaced apartfrom the base surface 218 by a first distance DA, where the firstdistance DA generally corresponds to or is associated with a maximumdepth setting (FIG. 10) of the seed planting unit. A second level 208Eis spaced apart from the base surface 218 by a second distance DE, wherethe second distance DE corresponds to or is associated with a minimumdepth setting (FIG. 11) of the seed planting unit 108.

Additionally, as shown in FIG. 5, the graduated profile 206 of the depthadjustment member 200 may include a series of intermediate levels. Inthis regard, each of the intermediate levels may be spaced apart fromthe base surface 218 by a respective larger distance than a respectiveprevious level. For example, a first intermediate level 208B positionedadjacent the first level 208A is spaced apart from the base surface 218by a first intermediate distance DB, which is larger than the firstdistance DA. Similarly, a second intermediate level 208C positionedadjacent the first intermediate level 208B is spaced apart from the basesurface 218 by a second intermediate distance DC, which is larger thanthe first intermediate distance DB. Additionally, a third intermediatelevel 208D positioned between the second intermediate level 208C and thesecond level 208E is spaced apart from the base surface 218 by a thirdintermediate distance DD, which is larger than the second intermediatedistance DC and smaller than the second distance DE. Thus, the distancebetween respective, consecutive levels of the plurality of levels 208and the base surface 218 increases from the first level 208A through theintermediate levels 220 to the second level 208E of the graduatedprofile 206. In such an embodiment, the graduated profile 206 of thedepth adjustment member 200 generally defines the depth adjustment rangefor the penetration depth of the opener 120.

It should be appreciated that, in some embodiments, the distance betweenrespective, consecutive levels of the plurality of levels 208 and thebase surface 218 may be configured to non-linearly increase from thefirst level 208A through the intermediate levels 220 to the second level208E of the depth adjustment member 200. With such a non-linearincrease, the penetration depth setting 122 may be configured to providemore fine or gradual changes within certain ranges (e.g., shallowerranges) of the opener's penetration depth that may require more precisepositioning of the seed within the soil 124 and coarser or largerchanges within other ranges (e.g., deeper ranges) of the opener'spenetration depth where less precise positioning of the seed within thesoil 124 is required. Further, while the graduated profile 206 of thedepth adjustment member 200 is shown as only including five levels, thisshould not be construed as limiting. Instead, the graduated profile 206may be configured to define any number of levels 208 to provide adesired range of incremental levels for adjusting the penetration depthsetting 122.

As indicated above, the depth adjustment member 200 may be configured tobe installed relative to or otherwise be supported by the wheel supportarm 128 of the seed planting unit 108 such that it may be selectivelyrotatable or movable relative to the wheel support arm 128.Specifically, as shown in FIGS. 3 and 6, the depth adjustment member 200may be configured to be coupled to the lower portion 136 of the wheelsupport arm 128 such that the depth adjustment member 200 may be movablerelative to the wheel support arm 128. For example, in one embodiment,the depth adjustment member 200 may include an elongated portion 222extending from the abutment portion 204 of the adjustment member 200that is configured to be engaged or received within a slot 224 definedwithin the lower portion 136 of the wheel support arm 128. Specifically,as shown in FIG. 6, the elongated portion 222 may be configured toextend outwardly from the base surface 218 of the abutment portion 204,opposite the graduated profile 206. For example, the elongated portion222 may generally form a circular rod or cylinder extending between afirst end 226 and a second end 228 along the axis of rotation 214 of thedepth adjustment member 200, with the first end 226 of the elongatedportion 222 being positioned proximate the base surface 218 of the depthadjustment member 200. It should be appreciated that, in otherembodiments, the depth adjustment member 200 may be otherwise configuredto be installed relative to or otherwise be supported by the wheelsupport arm 128 such that it may be selectively rotatable or movablerelative to the wheel support arm 128. In such embodiments, the depthadjustment member 200 may axially slide and/or rotate relative to thewheel support arm 128 across a range of positions to thus set thedesired penetration depth for the opener 120.

By slidably and/or rotatably coupling the depth adjustment member 200 tothe wheel support arm 128, the depth adjustment member 200 may be movedrelative to the wheel support arm 128 to a suitable position that allowsthe depth stop member 202 to abut against the first level 208A of thedepth adjustment member 200 when the seed planting unit 108 is locatedat its working position. As shown in FIG. 10, at such position, theopener 120 may be disposed at its maximum penetration depth setting 122.Similarly, the depth adjustment member 200 may be rotated relative tothe wheel support arm 128 to a suitable position that allows the depthstop member 202 to abut against the second level 208E of the depthadjustment member 200 when the seed planting unit 108 is located at itsworking position. As shown in FIG. 11, at such position, the opener 120may be disposed at its minimum penetration depth setting 122.Additionally, the depth adjustment member 200 may be rotated relative tothe wheel support arm 128 to any other suitable orientation relative tothe depth stop member 202 that allows the depth stop member 202 to abutagainst any of the intermediate levels defined between the first andsecond levels 208A, 208E.

As indicated above, in several embodiments, the depth stop member 202may be fixed relative to the support structure 126, such as by beingformed integrally with the support structure 126 and/or by being rigidlycoupled to the support structure 126. As shown in FIG. 7, in oneembodiment, the depth stop member 202 may generally include an extendingportion 230 and a contacting portion 232. The extending portion 230extends generally outwardly from the support structure 126 along alength 240 defined between a proximal end 234 and a distal end 236. Thelength 240 of the extending portion 230 is configured such that each ofthe levels 208 may be selectively abutted against by the contactingportion 232 depending on the rotational orientation of the depthadjustment member 200 relative to the stop member 202. Additionally, thecontacting portion 232 may generally extend downwardly at the distal end236 of the extending portion 230 to form an abutment surface 238configured to contact or otherwise abut against the levels 208. Theabutment surface 238 may be configured, as shown in FIG. 7, to be planarsuch that, when the depth stop member 202 contacts the depth adjustmentmember 200, the abutment surface 238 is substantially parallel to theadjacent level 208 against which the depth stop member 202 is abutting.However, it should be appreciated that the abutment surface 238 may haveany other suitable configuration that allows it to abut against thedesired level 208 of the depth adjustment member 200.

Moreover, as indicated above, the support structure 126 may be movablebetween a working position and an adjustment position. Morespecifically, when the seed planting unit 108 is lifted (e.g., bycylinder 116) such that the wheel 130 and opener 120 are no longer inengagement or contact with the soil 124, the support structure 126 (andassociated depth stop member 200) may rotate into the adjustmentposition and the wheel support arm 128 may pivot downward into a morevertical orientation relative to the soil 124 such that the depthadjustment member 200 is spaced apart from the depth stop member 202.While the support structure 126 is in the adjustment position, the depthadjustment member 200 may be configured to be slidable or rotatablerelative to the wheel support arm 128 to selectively orient the desiredadjustment level 208 relative to the depth stop member 202. When thedesired position of the depth adjustment member 200 relative to thewheel support arm 128 is reached, the seed planting unit 108 may belowered such that the support structure 126 rotates into the workingposition and the wheel 130 again engages the soil 124, causing the lowerportion 136 of the wheel support arm 128 to pivot upward until theabutment surface 238 of the depth stop member 202 abuts against theadjacent level 208 of the depth adjustment member 200, thus limitingfurther rotation of the wheel support arm 128 relative to the supportstructure 126.

Additionally, in several embodiments, the depth adjustment member 200may be configured to be locked or otherwise fixed relative to the wheelsupport arm 128. For example, in one embodiment, the depth adjustmentmember 200 may be configured to be selectively engaged with a portion ofthe wheel support arm 128 to maintain a rotational position of the depthadjustment member 200 relative to the depth stop member 202.Specifically, in one embodiment, the depth adjustment member 200 may berotationally fixed to the wheel support arm 128 via one or moreengagement elements 240 configured to be provided in interlockingengagement with corresponding engagement elements 242 of the wheelsupport arm 128. As shown in FIG. 6, the depth adjustment member 200 mayinclude a plurality of axially outwardly extending engagement elements,such as engagement teeth 240 extending axially outwardly from the basesurface 218. The engagement teeth 240 may be configured to engage ormesh with corresponding engagement elements 242 of the wheel support arm128, with the number of pairs of engagement teeth 240 and correspondingengagement elements 242 generally corresponding to the number of levels208 defined by the abutment portion 204 of the depth adjustment member200.

In one embodiment, as shown schematically in FIG. 4, the engagementteeth 240 are configured to be evenly spaced apart from one anotheralong the circumferential direction by a circumferential angle thatgenerally corresponds to the circumferential angle defined by each ofthe sections 216 (e.g., by the circumferential angle A1). The engagementteeth 240 may further be configured such that each of the engagementteeth 240 is radially spaced apart from the axis of rotation 214 by aradial distance R1. Moreover, as is particularly illustrated in FIG. 6,the recesses 242 may defined relative to an outer surface of the wheelsupport arm 128 (i.e., an upper surface 244) so as to be spaced apart inthe same manner as the engagement teeth 240 from the axis of rotation214, thereby allowing the teeth 240 to be received within the recesses242 when it is desired to lock the rotational orientation of the depthadjustment member 200 relative to the wheel support arm 128.

It should be appreciated that, in alternative embodiments, the first andsecond engagement elements 240, 242 may have any other suitableconfiguration and/or may correspond to any other suitable elementsand/or features that allow the disclosed depth adjustment member 200 togenerally function as described herein. For instance, in anotherembodiment, the first and second engagement elements 240, 242 may bothbe configured as axially outwardly extending elements from theirrespective surfaces 218, 244 such that the first engagement elements 240are configured to be received between the second engagement elements 242to prevent rotation of the depth adjustment member 200 relative to thewheel support arm 128.

Additionally, in one embodiment, the depth adjustment member 200 may beaxially biased such that the abutment portion 204 is configured to becontinuously biased towards the wheel support arm 128. As shown in FIG.8, the elongated portion 222 of the depth adjustment member 200 mayinclude a flanged portion 246 proximate its second end 228. The flangedportion 246 may be disposed proximate a side (i.e., a lower surface 248)of the wheel support arm 128 opposite the abutment portion 204 of thedepth adjustment member 200. A biasing element, such as a spring 250,may be disposed around the elongated portion 222 and may be held betweenthe flanged portion 246 and the lower surface 248 of the wheel supportarm 128. The spring 250 may provide a biasing force that biases theflanged portion 246 away from the lower surface 248 of the wheel supportarm 128 such that the abutment portion 204 of the depth adjustmentmember 200 is biased towards the upper surface 244 of the wheel supportarm 128. Thus, the engagement teeth 240 may be configured to be normallybiased towards the recesses 242 such that when the engagement teeth 240are rotationally aligned with the recesses 242, the engagement teeth 240may be received within the recesses 242. If the engagement teeth 240 arenot rotationally aligned with the recesses 242 when the abutment portion204 is biased against the upper surface 244 of the wheel support arm128, the depth adjustment member 200 may further be rotated until theengagement teeth 240 are received within the recesses 242. Additionally,when the biasing force of the spring 250 is overcome (e.g., by theoperator pushing or pulling on the depth adjustment member 202), theengagement teeth 240 may be removed from the recesses 242 such that thedepth adjustment member 200 may be rotated relative to the wheel supportarm 128.

It should be appreciated that, in alternative embodiments, the biasingelement 250 may have any other suitable configuration and/or maycorrespond to any other suitable elements and/or features that allow thedisclosed depth adjustment member 200 to generally function as describedherein.

In another embodiment, the depth adjustment member 200 may beselectively axially locked such that the bottom surface 218 of theabutment portion 204 is configured to be axially locked against theupper surface 244 of the wheel support arm 128. As shown in FIG. 9, theelongated portion 222 of the depth adjustment member 200 may beconfigured to be selectively engaged with a locking element 252 suchthat the locking element 252 limits or prevents axial movement of theelongated portion 222 within the slot 224. The locking element 252 maybe a threaded fastener, such as a threaded nut, with at least a portionof the elongated portion 222 being correspondingly threaded. Once adesired rotational position of the depth adjustment member 200 has beenestablished and the first and engagement elements 240, 242 are engaged,the threaded nut 252 may be threaded onto and/or tightened along theelongated portion 222 until the threaded nut 252 abuts against the lowersurface 248 of the wheel support arm 128, thus essentially preventing oreliminating axial movement of the elongated portion 222 within the slot224. With the axial movement of the elongated portion 222 restricted,the engagement elements 240, 242 may not be disengaged in a manner thatwould allow the depth adjustment member 200 to be rotated relative tothe wheel support arm 128 until the threaded nut 252 is again loosenedalong or removed from the elongated portion 222. It should beappreciated that the locking element 252 may be otherwise configured toallow the elongated portion 222 of the depth adjustment member 200 to beaxially locked relative to the wheel support arm 128.

Referring now to FIGS. 12 and 13, a partial perspective view of afurther embodiment of the seed planting unit 108 described above isillustrated in accordance with aspects of the present invention.Specifically, FIGS. 12 and 13 illustrate alternative embodiments of theseed planting unit 108 having the depth adjustment member 200 and anactuator 300 configured for automatic adjustment of the penetrationdepth setting 122 of the opener 120. As discussed in detail below, thedepth adjustment member 200 is configured to be rotatable or otherwisemovable by the actuator 300 relative to the wheel support arm 128 whenit is desired to adjust the penetration depth setting 122 of the opener120.

In the embodiments illustrated in FIGS. 12 and 13, the actuator 300includes a motor 302, with the motor 302 being configured to rotate ashaft 304. In the embodiment shown in FIG. 12, the elongated portion 222of the depth adjustment member 200 may be connected to or form part ofthe shaft 304. Such a configuration provides for direct driving of theelongated portion 222 by the actuator 300. As such, rotation of theshaft 304 by the motor 302 causes the depth adjustment member 200 torotate relative to the wheel support arm 128 such that the depth stopmember 202 may abut against a different level 208 of the abutmentportion 204 when the support structure 126 is in the working position toadjust the penetration depth setting of the opener 120.

In one embodiment, as shown in FIG. 13, the actuator 300 is connectedthrough a gear assembly 306 having at least a first gear 306A and asecond gear 306B. The first gear 306A may be rotationally fixed to theshaft 304 and the second gear 306B may be rotationally fixed to theelongated portion 222 of the depth adjustment member 200, with thesecond gear 306B meshing with the first gear 306A. Such a gear assembly306 may allow for different gear ratios between the input at the shaft304 and the output at the elongated portion 222. As the shaft 304rotates, the depth adjustment member 200 rotates relative to the wheelsupport arm 128 such that the depth stop member 202 may abut against adifferent level 208 of the abutment portion 204 when the supportstructure 126 is in the working position to adjust the penetration depthsetting of the opener 120. It should be appreciated that, in alternativeembodiments, the depth adjustment member 200 may be actuated by themotor 302 in any other suitable manner, such as by, e.g., a beltextending around the circumference of the depth adjustment member.

In several embodiments, the operation of the actuator 300 may beelectronically controlled via a controller 308, such as any suitableprocessor-based device(s) having a processor and a memory configured tostore computer-readable instructions that can be executed by theprocessor. In such embodiments, the controller 308 may becommunicatively coupled to the motor 302 to control the operationalspeed and direction of the motor 302, and thus the rotation of the depthadjustment member 200 relative to the adjacent wheel support arm 128.

Moreover, the controller 308 may also include a communications interface310 to provide a means for the controller 308 to communicate with any ofthe various other system components of the agricultural implement and/orany components of the work vehicle towing the implement. For instance,one or more communicative links 312 may be provided between thecommunications interface 310 and a user interface 314 to allow thecontroller to receive input signals from the user interface 314. Theuser interface 314 may be configured to receive information from theoperator, such as, but not limited to, information regarding the desiredpenetration depth setting for the opener 120, and to send input signalsto the communications interface 310 via the communicative links 312.Similarly, one or more communicative interfaces 316 may be providedbetween the communications interface 310 and the actuator(s) 300 (and/ora related component configured to control the operation of theactuator(s) 300) to allow the operation of the actuator(s) 300 to becontrolled by the controller 308.

By configuring the seed planting unit 108 to have an electronicallycontrolled actuator, such as the actuator 300 described above withreference to FIGS. 12 and 13, the penetration depth of the seed plantingunit 108 may be adjusted automatically (i.e., without manualmanipulation of the depth adjustment member 200) when the supportstructure 126 is in the adjustment position. As such, the time requiredto adjust the penetration depth may be significantly reduced, thusincreasing seeding efficiency. For example, in instances in which eachseed planting unit 108 includes an associated actuator 300, the operatormay provide an input (via the user interface 314) instructing thecontroller 308 to control the operation of the various actuators 300such that the penetration depth setting for each opener 120 of theimplement is adjusted to a given operator-selected setting.Additionally, the depth adjustment member 200 may be locked into arotational position relative to the wheel support arm 128 by use of theactuator 300 alone, thus reducing material costs and the complexity ofthe seed planting unit 108.

Referring now to FIG. 14, a partial, perspective view of anotherembodiment of a seed planting unit 108 suitable for use within theagricultural implement shown in FIG. 1 is illustrated in accordance withaspects of the present subject matter. Specifically, FIG. 14 illustratesan alternative embodiment of the seed planting unit 108 having a supportstructure 126′, a wheel support arm 128′, an adjustment member 200′, anda depth stop member 202′. As discussed in greater detail below, thedepth adjustment member 200′ is configured to be supported by orotherwise installed relative to the support structure 126′ of the seedplanting unit 108 such that it may be selectively rotatable relative tothe support structure 126′ when it is desired to adjust the penetrationdepth setting 122 of the opener 120. Further, the depth stop member 202′may be provided in operative association with the wheel support arm 128′to selectively abut against the depth adjustment member 200′, therebysetting the desired penetration depth for the opener 120.

In the illustrated embodiment, both the support structure 126′ and thewheel support arm 128′ are generally configured the same as or similarto the support structure 126 and the wheel support arm 128,respectively, described above with reference to the embodiments shown inFIGS. 3-13. However, unlike the support structure 126 described abovethat includes the depth stop member 202 extending therefrom, the supportstructure 126′ instead includes a slot 224′ (e.g., configured the sameas or similar to the slot 224 of the wheel support arm 128 describedabove) configured to allow the depth adjustment member 200′ to berotatably coupled to the support structure 126′. In such an embodiment,the depth stop member 202′ may, instead, be provided in operativeassociation with the wheel support arm 128′. For example, as shown inFIG. 14, the depth stop member 202′ may be formed integrally with orrigidly coupled to a portion of the wheel support arm 128′ such that thedepth stop member 202′ extends outwardly therefrom in the direction ofthe location at which the depth adjustment member 200′ is installed onthe support structure 126′. As such, the depth adjustment member 200′may be moved relative to the support structure 126′ to a suitableposition that allows the depth stop member 202′ to abut against a givenlevel of the depth adjustment member 200′ to set the desired penetrationdepth setting for the open 120. For example, the depth adjustment member200′ may be moved relative to the support structure 126′ to a suitableposition that allows the depth stop member 202′ to abut against theshortest level of the depth adjustment member 200′ (e.g., first level208A shown in FIG. 5), thereby allowing the opener 120 to be disposed atits maximum penetration depth setting 122. Similarly, the depthadjustment member 200′ may be moved relative to the support structure126′ to a suitable position that allows the depth stop member 202′ toabut against the tallest level of the depth adjustment member 200′(e.g., the second level 208E shown in FIG. 5), thereby allowing theopener 120 to be disposed at its minimum penetration depth setting 122.

By configuring the seed planting unit 108 to have the relativepositioning of the depth adjustment member 200′ and the depth stopmember 202′ described above with reference to FIG. 14, the penetrationdepth of the seed planting unit 108 may be adjusted at a differentposition along the seed planting unit 108, thus providing more locationsfor the user to access the depth adjustment member 200′ to adjust thepenetration depth setting, which may improve the ergonomics or accessfor such an adjustment. In such a way, the time or maneuveringdifficulty for adjusting the penetration depth may be reducedsignificantly, thus increasing seeding efficiency.

Referring now to FIGS. 15-17, an additional or alternative embodiment ofthe seed planting unit 108 suitable for use within the agriculturalimplement shown in FIG. 1 is illustrated in accordance with aspects ofthe present subject matter. Specifically, FIG. 15 illustrates a sideview of the seed planting unit 108 having at least one spacer element400. As discussed in detail below, the depth adjustment member 200 isconfigured to be selectively movable relative to the wheel support arm128 when it is desired to adjust the penetration depth setting 122 ofthe opener 120. Further, the depth adjustment member 200 may beconfigured to be selectively locked relative to the wheel support arm128 to prevent further relative movement of the depth adjustment member200, thereby setting the desired penetration depth for the opener 120.

In the illustrated embodiment, the abutment portion 204 of the depthadjustment member 200 may or may not include the graduated profile 206as described above with reference to FIGS. 3-13. For example, as shownin FIGS. 15-17, the abutment portion 204 may instead be planar. As such,the penetration depth of the opener 120 may instead be adjusted byspacing the abutment portion 204 axially apart from the wheel supportarm 128 such that the base surface 218 is no longer in axial contactwith the wheel support arm 128. This is accomplished, as shown in FIGS.15-17, by adding one or more spacer elements 400 between the basesurface 218 of the abutment portion 204 and the upper surface 244 of thewheel support arm 128.

Each spacer element 400 may be receivable around the elongated portion222 of the depth adjustment member 200. For example, each spacer element400 may have a spacing portion 402 that is configured to be at leastpartially received around the elongated portion 222. The spacing portion402 of each spacer element 400 may have a thickness parallel to the axisof rotation 214 of the elongated portion 222. It should be appreciatedthat, in some embodiments, as shown in FIG. 17, the thickness of eachspacing portion 402 may be configured to be different, with the spacerelements 400 being stackable along the elongated portion 222 to providemore adjustment increments of the opener's penetration depth for moreprecise positioning of the seed within the soil 124. For example, afirst spacer element 400A has a thickness 404A, a second spacer element400B has a thickness 404B that is configured to be less than thethickness 404A, and third spacer elements 400C each have a thickness404C that is less than the thickness 404B. Alternatively, the spacingportion 402 of each spacer element 400 may have an equal thickness.Further, while only four spacer elements 400 are shown, this should notbe construed as limiting. Instead, any number of spacer elements 400 maybe used to provide a desired penetration depth range for adjusting thepenetration depth setting 122.

As is particularly shown in FIG. 18, in one embodiment, the spacingportion 402 may include an opening 406 for installing the spacerelements 400 around the elongated portion 222. In one embodiment, thespacing portion 402 may be formed out of a semi-flexible material suchthat the spacing portion 402 may be configured to fit tightly around atleast a portion of the elongated portion 222 and such that the spacerelement 400 may not be accidentally removed from around the elongatedportion 22. Each spacer element 400 may further include a handle 408extending radially outwardly from the spacing portion 402. The handle408 may be configured to allow the operator to effectively grasp thespacer element 400, thereby permitting the operator to manually adjustthe position of the abutment portion 202 relative to the wheel supportarm 128. An operator may install each spacer element 400 on theelongated portion 222 by first pulling the base surface 218 of theabutment portion 202 of the depth adjustment member 200 away from thewheel support arm 128 (e.g., against the bias provided by an associatingbiasing element, such as the spring 250 shown in FIG. 8). The user maythen add one or more spacer elements 400 until the desired penetrationdepth setting 122 of the opener 120 is attainable when the operatorallows the abutment portion 202 to again be axially biased towards orlocked relative to the wheel support arm 128.

By configuring the seed planting unit 108 to have spacer elements, suchas the one or more spacer elements 400 described above with reference toFIGS. 15-18, the penetration depth of the seed planting unit 108 may beeasily and quickly be adjusted when the support structure 126 is in theadjustment position using relatively simple parts. In such manner, thetime and complexity required to adjust the penetration depth may besignificantly reduced, thus increasing seeding efficiency and reducingcosts. Additionally, it should be appreciated that, in an embodimentwhere the abutment portion 204 includes the graduated profile 206, thegraduated profile may be further spaced apart from the wheel support arm128 by adding one or more of the spacer elements 400. As such, thepenetration depth of the opener 120 may have an extended depthadjustment range, thus allowing for a greater potential change betweenthe minimum and maximum penetration depth setting of the opener 120.

This written description uses examples to disclose the invention,including the best mode, and also to enable any person skilled in theart to practice the invention, including making and using any devices orsystems and performing any incorporated methods. The patentable scope ofthe invention is defined by the claims, and may include other examplesthat occur to those skilled in the art. Such other examples are intendedto be within the scope of the claims if they include structural elementsthat do not differ from the literal language of the claims, or if theyinclude equivalent structural elements with insubstantial differencesfrom the literal languages of the claims.

What is claimed is:
 1. A seed planting unit of an agriculturalimplement, the seed planting unit comprising: a ground engaging toolconfigured to penetrate a soil surface; a support structure configuredto support the ground engaging tool; a wheel support arm pivotallycoupled to the support structure, the wheel support arm including anupper portion and a lower portion; a wheel rotatably supported by thelower portion of the wheel support arm, the wheel configured to contactthe soil surface to define a penetration depth setting for the groundengaging tool relative to the soil surface; a depth stop member providedin operative association with one of the support structure or the wheelsupport arm; and a depth adjustment member having a base surface anddefining a plurality of levels disposed at varying distances relative tothe base surface, wherein the depth stop member is configured to abutagainst a selected level of the plurality of levels when the wheel iscontacting the soil surface to set the penetration depth setting for theground engaging tool, and wherein the depth adjustment member isconfigured to be selectively rotated relative to the other of thesupport structure or the wheel support arm to position the selectedlevel for abutment with the depth stop member.
 2. The seed planting unitof claim 1, wherein the depth adjustment member includes a plurality ofadjustment sections positioned around an outer perimeter of the depthadjustment member, each of the plurality of levels being defined by arespective adjustment section of the plurality of adjustment sections.3. The seed planting unit of claim 2, wherein the depth adjustmentmember is configured as a depth adjustment wheel such that the outerperimeter is defined by an outer circumference of the depth adjustmentmember, each of the plurality of adjustment sections extendingcircumferentially around a respective circumferential section of theouter circumference of the depth adjustment member.
 4. The seed plantingunit of claim 1, wherein: a first level of the plurality of levels isspaced apart from the base surface by a first distance associated with amaximum depth setting for the ground engaging tool, and a second levelof the plurality of levels is spaced apart from the base surface by asecond distance associated with a minimum depth setting for the groundengaging tool.
 5. The seed planting unit of claim 4, wherein theplurality of levels further comprises a plurality of intermediatelevels, each successive intermediate level of the plurality ofintermediate levels from adjacent to the first level to adjacent to thesecond level being spaced apart from the base surface by a respectivelarger distance than a respective previous intermediate level of theplurality of intermediate levels.
 6. The seed planting unit of claim 1,wherein the depth adjustment member is configured to be selectivelyengaged with a portion of the other of the support structure or thewheel support arm to maintain a rotational position of the depthadjustment member relative to the depth stop member.
 7. The seedplanting unit of claim 6, further comprising a biasing member configuredto apply a biasing force against the depth adjustment member to bias thedepth adjustment member into engagement with the portion of the other ofthe support structure or the wheel support arm such that the depthadjustment member must be moved against the biasing force of the biasingmember to disengage the depth adjustment member from the portion of theother of the support structure or the wheel support arm to rotate thedepth adjustment member.
 8. The seed planting unit of claim 6, furthercomprising a locking element, the locking element configured to beselectively engaged with an elongated portion of the depth adjustmentmember configured to extend through a slot defined by the other of thesupport structure of wheel support arm, such that the locking elementprevents axial movement of the depth adjustment member to keep the depthadjustment member in engagement with the portion of the other of thesupport structure or the wheel support arm.
 9. The seed planting unit ofclaim 1, further comprising an actuator coupled to the depth adjustmentmember, the actuator being configured to selectively rotate the depthadjustment member relative to the other of the support structure or thewheel support arm to position the selected level for abutment with thedepth stop member.
 10. The seed planting unit of claim 1, wherein thedepth adjustment member includes an elongated portion configured toextend through a slot defined by the other of the support structure ofwheel support arm.
 11. An agricultural implement, comprising: a frame;and a plurality of seed planting units supported by the frame, theplurality of seed planting units being configured to deposit seedswithin a field as the implement is moved across the field, each seedplanting unit comprising: a ground engaging tool configured to penetratea soil surface; a support structure configured to support the groundengaging tool; a wheel support arm pivotally coupled to the supportstructure, the wheel support arm including an upper portion and a lowerportion; a wheel rotatably supported by the lower portion of the wheelsupport arm, the wheel configured to contact the soil surface to definea penetration depth setting for the ground engaging tool relative to thesoil surface; a depth stop member provided in operative association withone of the support structure or the wheel support arm; and a depthadjustment member having a base surface and defining a plurality oflevels disposed at varying distances relative to the base surface,wherein the depth stop member is configured to abut against a selectedlevel of the plurality of levels when the wheel is contacting the soilsurface to set the penetration depth setting for the ground engagingtool, and wherein the depth adjustment member is configured to beselectively rotated relative to the other of the support structure orthe wheel support arm to position the selected level for abutment withthe depth stop member.
 12. The agricultural implement of claim 11,wherein the depth adjustment member includes a plurality of adjustmentsections positioned around an outer perimeter of the depth adjustmentmember, each of the plurality of levels being defined by a respectiveadjustment section of the plurality of adjustment sections.
 13. Theagricultural implement of claim 12, wherein the depth adjustment memberis configured as a depth adjustment wheel such that the outer perimeteris defined by an outer circumference of the depth adjustment member,each of the plurality of adjustment sections extending circumferentiallyaround a respective circumferential section of the outer circumferenceof the depth adjustment member.
 14. The agricultural implement of claim11, wherein: a first level of the plurality of levels is spaced apartfrom the base surface by a first distance associated with a maximumdepth setting for the ground engaging tool, and a second level of theplurality of levels is spaced apart from the base surface by a seconddistance associated with a minimum depth setting for the ground engagingtool.
 15. The agricultural implement of claim 14, wherein the pluralityof levels further comprises a plurality of intermediate levels, eachsuccessive intermediate level of the plurality of intermediate levelsfrom adjacent to the first level to adjacent to the second level beingspaced apart from the base surface by a respective larger distance thana respective previous intermediate level of the plurality ofintermediate levels.
 16. The agricultural implement of claim 11, whereinthe depth adjustment member is configured to be selectively engaged witha portion of the other of the support structure or the wheel support armto maintain a rotational position of the depth adjustment memberrelative to the depth stop member.
 17. The agricultural implement ofclaim 16, wherein each seed planting unit further comprises a biasingmember configured to apply a biasing force against the depth adjustmentmember to bias the depth adjustment member into engagement with theportion of the other of the support structure or the wheel support armsuch that the depth adjustment member must be moved against the biasingforce of the biasing member to disengage the depth adjustment memberfrom the portion of the other of the support structure or the wheelsupport arm to rotate the depth adjustment member.
 18. The agriculturalimplement of claim 16, wherein each seed planting unit further comprisesa locking element, the locking element configured to be selectivelyengaged with an elongated portion of the depth adjustment memberconfigured to extend through a slot defined by the other of the supportstructure of wheel support arm, such that the locking element preventsaxial movement of the depth adjustment member to keep the depthadjustment member in engagement with the portion of the other of thesupport structure or the wheel support arm.
 19. The agriculturalimplement of claim 11, wherein each seed planting unit further comprisesan actuator coupled to the depth adjustment member, the actuator beingconfigured to selectively rotate the depth adjustment member relative tothe other of the support structure or the wheel support arm to positionthe selected level for abutment with the depth stop member.
 20. Theagricultural implement of claim 11, wherein the depth adjustment memberincludes an elongated portion configured to extend through a slotdefined by the other of the support structure of wheel support arm.